K.lingkaran : 2 . phi .r
: 2 .22/7 . 21
:132 cm
L.lingkaran : phi . r .r
: 22/7 . 21 .21
: 1386 cm2
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=22/7 . 42
=132 cm
luas =πr2
=22/7 . 21 .21
=1386cm2
K.lingkaran : 2 . phi .r
: 2 .22/7 . 21
:132 cm
L.lingkaran : phi . r .r
: 22/7 . 21 .21
: 1386 cm2